Testing for inplace store migrations

[sahith-narahari]

Summary

We need a way to test migrate functions are in sync with latest codebase.

Problem Definition

It is currently possible that changes are made to the codebase but migration scripts weren't updated based on new changes.
This causes migrations to fail during upgrade. Currently we have to test this manually to ensure upgrades aren't broken

Proposal

It would be nice to have a way to test this using cosmovisor. We can have binary of an older version of simapp in cosmovisor/testdata and use it to upgrade the chain to a latest version based on master. This should ensure migrations aren't broken.

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[amaury1093]

Thanks @sahith-narahari! I did a manual upgrade once and found some bugs that were not caught/catchable by the SDKs integration tests. So definitely a +1 for cosmovisor tests 👍

[tac0turtle]

we have this via system tests